Human language appears to be a unique phenomenon, without significant analogue in the animal world.
It's perfectly obvious that there is some genetic factor that distinguishes humans from other animals and that it is language-specific. The theory of that genetic component, whatever it turns out to be, is what is called universal grammar.
There isn't much doubt that like other animal societies, those of Homo sapiens involved plenty of cooperation, which might have been considerably enhanced, one would suppose, by the emergence of the remarkable instrument of language.
No one seriously doubts that if Piraha children are brought up in Boston they'll be speaking Boston English, that is, that the capacities are present, unlike other animals, as far as is known. There's no challenge to the theory - not mine, but everyone's - that the human language faculty provides the means for generation of an infinite array of structured expressions.
Human language is nothing like the signalling systems of other animals.
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